We report high resolution measurements of 372 NaCs 5 3 0 (v, J) ro-vibrational level energies in the range 0 ≤ v ≤ 22. The data have been used to construct NaCs 5 3 0 potential energy curves using the Rydberg-Klein-Rees and inverted perturbation approximation methods. Bound-free 5 3 0 (v, J) → 1(a) 3 + emission has also been measured, and is used to determine the repulsive wall of the 1(a) 3 + state and the 5 3 0 → 1(a) 3 + relative transition dipole moment function. Hyperfine structure in the

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... 3 0 state has not been observed in this experiment. This null result is explained using a simple vector coupling model. Autoscan Computer Autoscan C M Ring Dye Laser Krypton Ion Laser M Ch BS Argon Ion Laser Ti:Sapphire Laser Computer L J = 29 J = 31 J = 28 J = 29 J = 30 J = 28 J = 29 J = 30 J = 27 pump (scanned) collisional lines J = 28 J = 29 J = 30 J = 27 J = 31 J = 27 J = 28 J = 29